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8 hours, 59 minutes first pub 2008 (editions)

nonfiction science informative slow-paced
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298 pages first pub 2008 (editions)

nonfiction science informative slow-paced

287 pages first pub 2009 (editions)

nonfiction science challenging informative reflective slow-paced

304 pages first pub 2008 (editions)

nonfiction science informative slow-paced

8 hours, 44 minutes first pub 2008 (editions) user-added

nonfiction science informative slow-paced

304 pages first pub 2008 (editions)

nonfiction science informative slow-paced